A water pressure gauge is an optional item on all makes of outboard motors, not just Evinrude.
An RX4 prop that allows your engine to turn up close to the 6000 rpm redlines with a light load would be the ideal situation for a large pontoon boat like yours. That way when you load it up with people and gear, the motor will not be lugging or struggling to keep it on plane.
Propping is trial and error but as mentioned already, a 16" RX4 would be a good starting point.
5200 rpm max is overloading the motor and the computer controlled oiling system is adding more to help protect the engine. That is why consumption appears to be excessive.
"There is never just one thing wrong with a boat";
-- Travis McGee, main character in a book series by John D. McDonald
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The factory recommends that a properly trained technician service your Johnson or Evinrude outboard motor. Should you elect to perform repairs yourself, use caution, common sense, and observe safety procedures in the vicinity of flammable liquids, around moving parts, near high-temperature components, and working with electrical or ignition systems.
The information offered here is only general in nature and should not be construed as complete factory approved procedures, techniques, or specifications. Always use the proper service manual for your motor, up-to-date service literature, the correct tools, and have an understanding of how to proceed with troubleshooting and repair methods. If you are unsure or uncomfortable with a procedure, a situation, or a technique, enlist the services of a factory trained technician.
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